A post about a newly discovered statue of Amenhotep III also depicting his daughter Isis with the title of King's Wife also talks about the possibility of father-daughter marriages.

It was mentioned there that the topic is controversial (probably because the implied incest?)

Amenhotep III's daughters Sitamen and Isis are given titles of a consort.

There are depictions of Meritaten and Ankhesenpaaten with respective daughters named Meritaten-tasherit and Ankhesenpaaten-tasherit. Theories there vary from them being offspring of a marriage between Akhenaten and his daughters, the girls really being daughters of Kiya, daughters of Smenkhare and Meritaten, to theories that suggest they are figments of the imagination that have shown up due to usurped monuments.

There is another interesting example though: Queen Bintanath, the daughter of Ramesses II has the title Great Royal Wife. A daughter of her appears (twice) in the tomb of Queen Bintanath in the Valley of the Queens.

I guess we can use the same conjectures: 1. this is a daughter of Ramesses II and his daughter-wife Bintanath.
2. Given it's a funerary environment, this is some sort of ka of the queen (something like the theory proposed for the child in the tomb of Akhenaten in the mourning scene for Meketaten)
3. The daughter is the offspring of Bintanath and someone else (one of the crown princes?)

Just thought I would share the image.
It has been mentioned before that the topic does not seem to meet with much agreement with respect to the meaning/interpretation. Interesting though?_________________Math and Art: http://mathematicsaroundus.blogspot.com/

Does the daughter have appropriate titles to be considered a king's daughter? If not, Bintanath may have remarried after her father's death. Alternatively she could have become a queen consort following the death of a previous husband.

The daughter is called "Bodily King's Daughter" (Kenneth kitchen's Rammeside Inscriptions). So it seems the child is the daughter of a King.

Bintanath is one of the eldest daughters and is attested from fairly early in the reign of Ramesses II. Ramesses had a very long reign (he died in his 90's I think) so this child was born while Bintanath was Queen during the reign of her father. She likely did remarry after her father's death: There is a queen of the same name during the reign of her brother Merneptah. But if the girl is a daughter of Bintanath and Merneptah, they still must have conceived the child during the reign of Ramesses. She would have been much too old to conceive after her father died.

Not sure if she would have had a husband prior to becoming a great royal wife. The only other Princess who married a commoner (to my knowledge) is Tia, her aunt. Interesting idea though!_________________Math and Art: http://mathematicsaroundus.blogspot.com/

It is also posible that the title of Royal Wife given to Royal Daughters was rather honorific, in order to give them authority and grant their posterity, and their children would be fathered by unnamed mates, maybe some court officials whose wives are not depicted in their tombs.

Does the daughter have appropriate titles to be considered a king's daughter? If not, Bintanath may have remarried after her father's death. Alternatively she could have become a queen consort following the death of a previous husband.

Bintanath should be in her seventies when her father died that makes unlikely that she could give birth to anyone after this, and for the second hypothesis, I particulary think that's is quite difficult for a Pharaoh to get someone's leftover, even being his own daughter.